Where to measure: The graphic to the right shows where to measure the slider for pet door fitment. Measure inside the track from the very top to the very bottom, and choose a door with an adjustment range that fits your measurement.

If you can't get down to the bottom track because of the rail, this is not usually a problem. All of the pet doors have a notch in the bottom to accept that rail and it usually won't affect fitment unless it is taller than 1/2".

If your door is within 1/2 inch of the bottom of the range, call us to verify fitment. Example: Door measures 74 3/4" and the adjustment range is 74 1/2 to 77 1/2".

Can you still get through the door? A panel pet door takes up some of the available room in your slider. A safe way to estimate the width of the panel you are choosing is to add 5 inches to the flap width for the full panel width. A panel with a 10 inch wide flap will use about 15 inches of your available space in the slider. With this in mind, can you still get through the door? If not, buy a temporary panel so that you can move it out of the way to use the door yourself.